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From Michelle:

MICHELLE (7:10:33 AM): I have a Harry Potter comment!
MICHELLE (7:10:54 AM): How could the sword be a horcrux if Harry used it to destroy another horcrux? Can he do that?

Ooh, an intriguing thought... I don't know. Seriously, we have to know more about the rules of horcruxes. That could be an interesting point. If it were the case that one horcrux cannot destroy another horcrux, then Harry himself could not be a horcrux, because he (with the sword, of course) destroyed the diary... hmmm...